EthernetClient - availableForWrite() implementation

Author: JAndrassy

src/EthernetClient.cpp

@@ -228,6 +228,18 @@ UIPClient::_write(uip_userdata_t* u, const uint8_t *buf, size_t size)
   return 0;
 }
 
+int
+UIPClient::availableForWrite()
+{
+  const int MAX_AVAILABLE = UIP_SOCKET_DATALEN * UIP_SOCKET_NUMPACKETS;
+  UIPEthernetClass::tick();
+  if (data->packets_out[0] == NOBLOCK)
+    return MAX_AVAILABLE;
+  uint8_t p = _currentBlock(data->packets_out);
+  int used = UIP_SOCKET_DATALEN * p + data->out_pos;
+  return MAX_AVAILABLE - used;
+}
+
 void
 UIPClient::flush()
 {

src/EthernetClient.h

@@ -66,6 +66,7 @@ class EthernetClient : public Client {
 
   size_t write(uint8_t);
   size_t write(const uint8_t *buf, size_t size);
+  int availableForWrite();
   void flush(); // flush sends the buffered data
 
   int available();